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Mezzanine and Shareholders' Equity - Summary of Warrants (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Shares |  |  |  |
Warrants outstanding (in shares) | 3,331,995 | 3,648,541 | 0 |
Warrants assumed in the Merger (in shares) |  |  | 1,898,541 |
Warrants granted (in shares) | 0 | 0 | 1,750,000 |
Warrants exercised (in shares) | (177,405) | (286,357) |  |
Warrants forfeited (in shares) | 0 | (30,189) |  |
Warrants outstanding (in shares) | 3,154,590 | 3,331,995 | 3,648,541 | 0
Weighted Average Exercise Price |  |  |  |
Warrants outstanding (in dollars per share) | $ 9.93 | $ 9.75 | $ 0.00 |
Warrants assumed in the Merger (in dollars per share) |  |  | 9.06 |
Warrants granted (in dollars per share) | 0.00 | 0.00 | 10.49 |
Warrants exercised (in dollars per share) | 9.32 | 7.84 |  |
Warrants forfeited (in dollars per share) | 0.00 | 4.50 |  |
Warrants outstanding (in dollars per share) | $ 9.96 | $ 9.93 | $ 9.75 | $ 0.00
Weighted Average Remaining Contractual Term (Years) |  |  |  |
Warrants assumed in the Merger (term) |  |  | 2 years 8 months 9 days |
Warrants granted (term) |  |  | 5 years |
Warrants outstanding balance (term) | 2 years 4 days | 2 years 11 months 19 days | 3 years 8 months 26 days | 0 years
Aggregate Intrinsic Value |  |  |  |
Warrants outstanding | $ 26.7 | $ 33.1 | $ 52.0 | $ 0.0
Warrants assumed in the Merger |  |  | $ 1.8 |
Warrants exercised | $ 1.6 | $ 3.0 |  |

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